PWM (Pulse Width Modulation) power regulation device for realizing flux-weakening speed regulation of starting motor

Abstract

The utility model provides a power adjusting device for realizing weak magnetic starting of a starting motor in a pulse width modulation mode, which belongs to the technical field of electronics and comprises a first high-side current detection amplifier, a second high-side current detection amplifier, an operational amplifier, a main switch circuit, a main control circuit and a feedback amplifier. The starting motor is provided with an armature loop and an excitation loop, the first sampling resistor is connected with the armature loop and the first high-side current detection amplifier, and the operational amplifier is connected with the first high-side current detection amplifier and the main control circuit; the second sampling resistor is connected with the excitation loop and the second high-side current detection amplifier, the feedback amplifier is connected with the second high-side current detection amplifier and the main control circuit, and the main control loop is connected with the main switch circuit; the main switch circuit is connected with the product power supply end and the second sampling resistor; the device is simple in process, convenient to operate, easy to adjust and high in practical value.

Description

Technical Field

[0001] The utility model belongs to the field of electronic technology, and in particular relates to a PWM power regulating device for realizing magnetic-weakening speed regulation of a starting motor. Background Art

[0002] The traditional way to achieve weak magnetic speed regulation of the starter motor is the carbon column power regulator. The original carbon column electromagnetic power regulator is to insert a carbon column resistor in series in the excitation circuit, which reduces the supply voltage of the coil and reduces the excitation current, thereby weakening the excitation flux Φ, so that the starter motor can achieve weak magnetic speed increase above the rated speed.

[0003] However, the carbon column power conditioner has defects such as many parts, heavy volume, difficult debugging, and poor maintainability. Utility Model Content

[0004] To address the problems of carbon-column power regulators in related technologies, such as numerous parts, heavy volume, difficulty in debugging, and poor maintainability, the present invention provides a power regulator that uses pulse width modulation to achieve weak magnetic starting of a starter motor. This device features simple construction, convenient operation, ease of adjustment, and high practical value. The technical solution is as follows:

[0005] A PWM power regulation device for realizing weak magnetic speed regulation of a starter motor includes: a first high-side current detection amplifier, a second high-side current detection amplifier, an operational amplifier, a main switch circuit, a main control circuit, a feedback amplifier, a first sampling resistor RS1 and a second sampling resistor RS2. The starter motor is provided with an armature circuit and an excitation circuit.

[0006] The first sampling resistor RS1 is connected to the armature circuit and the first high-side current detection amplifier, and the operational amplifier is connected to the first high-side current detection amplifier and the main control circuit;

[0007] The second sampling resistor RS2 is connected to the excitation circuit and the second high-side current detection amplifier. The feedback amplifier is connected to the second high-side current detection amplifier and the main control circuit. The main control circuit is connected to the main switch circuit. The main switch circuit is connected to the product power supply terminal +28VDC and the second sampling resistor RS2.

[0008] Optionally, the first high-side current detection amplifier and the second high-side current detection amplifier are both composed of a resistor R1, a resistor R2, a resistor R3, a resistor RP1 and a chip INA170; wherein, pin 1 and pin 2 of the chip INA170 are connected to the first sampling resistor RS1 or the second sampling resistor RS2; pin 3 is connected to the first end of the resistor RP1, pin 8 is connected to the second end of the resistor RP1, pin 4 is connected to the third end of the resistor RP1, pin 8 is connected to +15V, pin 5 is connected to one end of the resistor R3, pin 6 (output end) is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to one end of R2; pin 6 is connected to an operational amplifier or a feedback amplifier; pin 4, the other end of the resistor R3, and the other end of the resistor R2 are grounded.

[0009] Optionally, the operational amplifier is composed of an operational amplifier chip AD620, a resistor R20, a resistor R21, a resistor R22 and a resistor R24; wherein, pin 2 of the operational amplifier chip AD620 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to Vcf; pin 3 is connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the first high-side current detection amplifier; pin 1 is connected to one end of the resistor R24, and pin 8 is connected to the other end of the resistor R24; pin 7 is connected to VCC; pin 6 is connected to one end of the resistor R22, and the other end of the resistor R22 is connected to the main control loop; pin 5 is grounded, and pin 4 is connected to VDD; wherein Vcf is a preset voltage, VCC is a positive power supply voltage, and VDD is a negative power supply voltage.

[0010] Optionally, the feedback amplifier is composed of an amplifier CA3140, resistors R40, R41 and R42; wherein, pin 3 of the amplifier CA3140 is connected to one end of the resistor R40, and the other end of the resistor R40 is connected to the second high-side current detection amplifier; pin 2 is connected to one end of the resistor R41 and one end of the resistor R42; pin 6 is connected to the other end of the resistor R42 and the main control loop, and the other end of the resistor R41 is grounded; and pin 7 is connected to VCC.

[0011] Optionally, the main control circuit is composed of an integrated pulse width regulator X1524, a resistor R30, a resistor R31, a capacitor C30, a capacitor C31 and a capacitor C32; wherein, pin 1 of the integrated pulse width regulator X1524 is connected to the feedback amplifier, pin 2 is connected to the operational amplifier, pin 1 is connected to one end of the resistor R31, the other end of the resistor R31 is connected to one end of the capacitor C32, and the other end of the capacitor C32 is connected to one end of the capacitor C30; pin 9 is connected to the other end of the capacitor C30; pin 4, pin 5 and pin 8 are grounded; pin 6 is connected to one end of the resistor R30, and the other end of the resistor R30 is grounded; pin 7 is connected to one end of the capacitor C31, and the other end of the capacitor C31 is grounded; pin 16 is connected to +15V; pin 14 and pin 11 are grounded; pin 13 and pin 12 are connected and connected to the main switching circuit.

[0012] Optionally, the main switch circuit is composed of an NPN transistor Q50, a PNP transistor Q51, a P-channel field effect transistor Q52, a P-channel field effect transistor Q53, an energy storage inductor L50, a voltage regulator diode D50, a resistor R50, and a capacitor C50; wherein the bases of the NPN transistor Q50 and the PNP transistor Q51 are connected to the main control circuit; the bases of the NPN transistor Q50 and the PNP transistor Q51 are connected to the positive electrode of the voltage regulator diode D50; the cathode of the voltage regulator diode D50, the collector of the NPN transistor Q50, the source of the P-channel field effect transistor Q52, and the source of the P-channel field effect transistor Q53 are connected to the product The power supply terminal is connected to +28VDC; the emitters of NPN transistor Q50 and PNP transistor Q51 are connected in parallel to one end of resistor R50, and the other end of resistor R50 is connected to the gates of P-channel field-effect transistors Q52 and Q53, respectively; the drains of P-channel field-effect transistors Q52 and Q53 are connected to one end of inductor L50, and the other end of inductor L50 is connected to one end of a second sampling resistor RS2 and one end of a capacitor C50. The collector of PNP transistor Q51 and the other end of capacitor C50 are grounded, and the other end of the second sampling resistor RS2 is connected to the excitation terminal of the starter motor.

[0013] This utility model provides a PWM power regulation device that sets the duty cycle and regulates the excitation current and armature current, thereby achieving field-weakening speed regulation. Parameters are set according to the armature / excitation characteristics of the starter motor. Based on functional requirements, the device is designed as a combination of a power board and a control board. Maintenance requires replacing the entire board, making it quick and convenient. The device features a simple structure, easy assembly, high reliability, ease of maintenance, and good practicality, making it easy to promote and apply. Currently, it has been applied in the field of starter motor control and has great practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a block diagram of the principle composition of the utility model.

[0015] Figure 2 This is the circuit diagram of high-side current detection amplifier circuit 1 and 2.

[0016] Figure 3 This is the circuit diagram of an operational amplifier.

[0017] Figure 4 This is the circuit diagram of the feedback amplifier.

[0018] Figure 5 Main control circuit diagram.

[0019] Figure 6 Main switch circuit diagram. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, combined with the flowchart of the method of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] The present invention provides a PWM power regulation device for realizing weak magnetic speed regulation of a starter motor. The starter motor is divided into an armature circuit and an excitation circuit. The current flowing through the armature circuit is called the armature current, and the current flowing through the excitation circuit is called the excitation current. The relationship between the armature current and the excitation current is that the armature current changes with the excitation current. This characteristic of the starter motor is used to set the change of the excitation circuit current to control the armature circuit current, thereby stabilizing the armature current. The utility model realizes weak magnetic speed regulation by reducing the excitation current.

[0022] The utility model provides a PWM power regulating device for realizing weak magnetic speed regulation of a starter motor. The device is a step-down (Buck) current-controlled switching power supply. The device adjusts the duty ratio of the excitation current and the armature current according to the starting characteristics of the starter motor, thereby controlling the starter motor to start smoothly.

[0023] See Figure 1 The device of the utility model includes a first high-side current detection amplifier (also known as high-side current detection amplifier 1), a second high-side current detection amplifier (also known as high-side current detection amplifier 2), an operational amplifier, a main switch circuit, a main control circuit, a feedback amplifier, a first sampling resistor RS1 and a second sampling resistor RS2. The starting motor is provided with an armature circuit and an excitation circuit.

[0024] The first sampling resistor RS1 is connected to the armature circuit and the first high-side current detection amplifier, and the operational amplifier is connected to the first high-side current detection amplifier and the main control circuit.

[0025] The first sampling resistor RS1 collects the armature current of the armature circuit, and the first high-side current detection amplifier amplifies the armature current collected by the first sampling resistor RS1 to obtain a voltage signal V1; the operational amplifier performs a subtraction amplification operation on the voltage signal V1 to obtain a voltage signal V3, and transmits the voltage signal V3 to the main control circuit;

[0026] The second sampling resistor RS2 is connected to the excitation circuit and the second high-side current detection amplifier, the feedback amplifier is connected to the second high-side current detection amplifier and the main control circuit, the main control circuit is connected to the main switch circuit; the main switch circuit is connected to +28VDC and the second sampling resistor RS2;

[0027] The second sampling resistor RS2 collects the excitation current of the excitation circuit, and the second high-side current detection amplifier amplifies the excitation current collected by the second sampling resistor RS2 to obtain a voltage signal V2; the feedback amplifier performs operation processing on the voltage signal V2 to obtain a voltage signal V4, and transmits the voltage signal V4 to the main control circuit;

[0028] The main control circuit performs PWM pulse width modulation on the voltage signal V3 at the armature end and the voltage signal V4 at the excitation end, and outputs the modulated square wave signal V5 to the main switching circuit;

[0029] The main switch circuit uses the Bark step-down principle to adjust the on and off of the switch circuit, control the magnitude of the excitation current, and then change the armature current, controlling the armature current within a preset range, so that the starter motor can start stably at an increased speed.

[0030] See also Figure 2 Both high-side current sense amplifiers 1 and 2 consist of resistors R1, R2, R3, RP1, and the INA170 chip. Pins 1 and 2 (inputs) of the INA170 chip are connected to the first sampling resistor RS1 or the second sampling resistor RS2. The first sampling resistor RS1 samples the armature current in the armature circuit, while the second sampling resistor RS2 samples the excitation current in the excitation circuit. Pin 3 is connected to the first end of resistor RP1, pin 8 is connected to the second end of resistor RP1, pin 4 is connected to the third end of resistor RP1, and pin 8 is connected to +15V. Pin 5 is connected to one end of resistor R3, and pin 6 (output) is connected to one end of resistor R1. The other end of resistor R1 is connected to one end of R2. Pin 6 is connected to an operational amplifier or feedback amplifier. Pin 4, the other end of resistor R3, and the other end of resistor R2 are grounded. The amplification factor of the INA170 can be set based on the values of resistors R1, R2, R3, and RP1.

[0031] See also Figure 3The operational amplifier mainly consists of the operational amplifier chip AD620, resistors R20, R21, R22, and R24. Pin 2 of the operational amplifier chip AD620 is connected to one end of resistor R20, and the other end of resistor R20 is connected to Vcf; pin 3 is connected to one end of resistor R21, and the other end of resistor R21 is connected to high-side current detection amplifier 1, specifically to pin 6 of the chip INA170, for inputting voltage signal V1; pin 1 is connected to one end of resistor R24, and pin 8 is connected to the other end of resistor R24; pin 7 is connected to VCC; pin 6 is connected to one end of resistor R22, and the other end of resistor R22 is connected to the main control circuit; pin 5 is grounded, and pin 4 is connected to VDD. Among them, Vcf is the preset voltage, VCC is the positive supply voltage, and VDD is the negative supply voltage.

[0032] The operational amplifier performs a subtraction operation on the voltage signal V1 from the high-side current detection amplifier 1 and the preset voltage Vcf through the operational amplifier chip AD620, and then amplifies the operation result to obtain a voltage signal V3 and transmits it to the main control loop.

[0033] See also Figure 4 The feedback amplifier consists of amplifier CA3140, resistors R40, R41, and R42. Pin 3 of amplifier CA3140 is connected to one end of resistor R40, and the other end of resistor R40 is connected to high-side current sense amplifier 2, specifically pin 6 of chip INA170, for inputting voltage signal V2; pin 2 is connected to one end of resistor R41 and one end of resistor R42; pin 6 is connected to the other end of resistor R42 and the main control loop, and the other end of resistor R41 is grounded; pin 7 is connected to VCC;

[0034] The feedback amplifier amplifies the voltage signal V2 from the high-side current detection amplifier 2 through the amplifier CA3140 to obtain a voltage signal V4 and transmits it to the main control loop.

[0035] See also Figure 5The main control circuit consists of an integrated pulse width regulator X1524, resistors R30, R31, capacitors C30, C31 and C32. Pin 1 of the integrated pulse width regulator X1524 is connected to the feedback amplifier and inputs the voltage signal V4; pin 2 is connected to the operational amplifier and inputs the voltage signal V3; pin 1 is connected to one end of the resistor R31, the other end of the resistor R31 is connected to one end of the capacitor C32, and the other end of the capacitor C32 is connected to one end of the capacitor C30; pin 9 is connected to the other end of the capacitor C30; pin 4, pin 5, and pin 8 are grounded; pin 6 is connected to one end of the resistor R30, and the other end of the resistor R30 is grounded; pin 7 is connected to one end of the capacitor C31, and the other end of the capacitor C31 is grounded; pin 16 is connected to +15V; pin 14 and pin 11 are grounded; pin 13 and pin 12 are connected and output the modulated square wave signal V5 to the main switching circuit.

[0036] See also Figure 6 The main switch circuit is composed of an NPN transistor Q50, a PNP transistor Q51, a P-channel field effect transistor Q52, a P-channel field effect transistor Q53, an energy storage inductor L50, a voltage regulator diode D50, a resistor R50, and a capacitor C50; the bases of the NPN transistor Q50 and the PNP transistor Q51 are connected to the main control circuit, specifically to pins 13 and 12 of the integrated pulse width regulator X1524, and the input voltage signal V5; the bases of the NPN transistor Q50 and the PNP transistor Q51 are connected to the anode of the voltage regulator diode D50; the cathode of the voltage regulator diode D50, the collector of the NPN transistor Q50, the source of the P-channel field effect transistor Q52, and the P-channel The source of field-effect transistor Q53 is connected to the product power supply terminal +28VDC; the emitter of NPN transistor Q50 and PNP transistor Q51 are connected in parallel to one end of resistor R50, and the other end of resistor R50 is connected to the gates of P-channel field-effect transistors Q52 and Q53 respectively; the drains of P-channel field-effect transistors Q52 and Q53 are connected to one end of inductor L50, and the other end of inductor L50 is connected to one end of a second sampling resistor RS2 and one end of a capacitor C50. The collector of PNP transistor Q51 and the other end of capacitor C50 are grounded, and the other end of the second sampling resistor RS2 is connected to the excitation end (excitation circuit) of the starter motor.

[0037] After the modulated square wave signal V5 output by the main control circuit passes through the main switching circuit, the voltage output to the excitation circuit will change with the duty cycle of the square wave signal V5, causing the current in the excitation circuit to change, thereby achieving the effect of weak magnetic speed regulation.

[0038] The above description is merely a detailed description of specific embodiments of the present invention. Any unspecified portions are conventional techniques. However, the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be readily conceived by a person skilled in the art within the technical scope disclosed in the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A PWM power regulation device for realizing magnetic-weakening speed regulation of a starting motor, characterized in that: include: A first high-side current detection amplifier, a second high-side current detection amplifier, an operational amplifier, a main switch circuit, a main control circuit, a feedback amplifier, a first sampling resistor RS1 and a second sampling resistor RS2, and a starter motor provided with an armature circuit and an excitation circuit. The first sampling resistor RS1 is connected to the armature circuit and the first high-side current detection amplifier, and the operational amplifier is connected to the first high-side current detection amplifier and the main control circuit; The second sampling resistor RS2 is connected to the excitation circuit and the second high-side current detection amplifier. The feedback amplifier is connected to the second high-side current detection amplifier and the main control circuit. The main control circuit is connected to the main switch circuit. The main switch circuit is connected to the product power supply terminal +28VDC and the second sampling resistor RS2.

2. The device according to claim 1, characterized in that The first high-side current detection amplifier and the second high-side current detection amplifier are both composed of a resistor R1, a resistor R2, a resistor R3, a resistor RP1 and a chip INA170; wherein, pin 1 and pin 2 of the chip INA170 are connected to the first sampling resistor RS1 or the second sampling resistor RS2; pin 3 is connected to the first end of the resistor RP1, pin 8 is connected to the second end of the resistor RP1, pin 4 is connected to the third end of the resistor RP1, pin 8 is connected to +15V, pin 5 is connected to one end of the resistor R3, pin 6 (output end) is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to one end of R2; pin 6 is connected to an operational amplifier or a feedback amplifier; pin 4, the other end of the resistor R3, and the other end of the resistor R2 are grounded.

3. The device according to claim 1, characterized in that The operational amplifier consists of an operational amplifier chip AD620, resistors R20, R21, R22, and R24; wherein, pin 2 of the operational amplifier chip AD620 is connected to one end of the resistor R20, and the other end of the resistor R20 is connected to Vcf; pin 3 is connected to one end of the resistor R21, and the other end of the resistor R21 is connected to the first high-side current detection amplifier; pin 1 is connected to one end of the resistor R24, and pin 8 is connected to the other end of the resistor R24; pin 7 is connected to VCC; pin 6 is connected to one end of the resistor R22, and the other end of the resistor R22 is connected to the main control loop; pin 5 is grounded, and pin 4 is connected to VDD; wherein Vcf is a preset voltage, VCC is a positive power supply voltage, and VDD is a negative power supply voltage.

4. The device according to claim 1, characterized in that The feedback amplifier consists of an amplifier CA3140, resistors R40, R41, and R42. Pin 3 of the amplifier CA3140 is connected to one end of the resistor R40, and the other end of the resistor R40 is connected to the second high-side current sense amplifier. Pin 2 is connected to one end of the resistor R41 and one end of the resistor R42. Pin 6 is connected to the other end of the resistor R42 and the main control loop, and the other end of the resistor R41 is grounded. Pin 7 is connected to VCC.

5. The device according to claim 1, characterized in that The main control circuit consists of an integrated pulse width regulator X1524, a resistor R30, a resistor R31, a capacitor C30, a capacitor C31 and a capacitor C32; wherein, pin 1 of the integrated pulse width regulator X1524 is connected to the feedback amplifier, pin 2 is connected to the operational amplifier, pin 1 is connected to one end of the resistor R31, the other end of the resistor R31 is connected to one end of the capacitor C32, and the other end of the capacitor C32 is connected to one end of the capacitor C30; pin 9 is connected to the other end of the capacitor C30; pins 4, 5 and 8 are grounded; pin 6 is connected to one end of the resistor R30, and the other end of the resistor R30 is grounded; pin 7 is connected to one end of the capacitor C31, and the other end of the capacitor C31 is grounded; pin 16 is connected to +15V; pins 14 and 11 are grounded; and pins 13 and 12 are connected and connected to the main switching circuit.

6. The device according to claim 1, characterized in that The main switch circuit consists of an NPN transistor Q50, a PNP transistor Q51, a P-channel field effect transistor Q52, a P-channel field effect transistor Q53, an energy storage inductor L50, a voltage-stabilizing diode D50, a resistor R50, and a capacitor C50. The bases of the NPN transistor Q50 and the PNP transistor Q51 are connected to the main control circuit; the bases of the NPN transistor Q50 and the PNP transistor Q51 are connected to the anode of the voltage-stabilizing diode D50; the cathode of the voltage-stabilizing diode D50, the collector of the NPN transistor Q50, the source of the P-channel field effect transistor Q52, and the source of the P-channel field effect transistor Q53 are connected to the product power supply. The NPN transistor Q50 is connected to the emitter of the PNP transistor Q51 and is connected in parallel to one end of the resistor R50. The other end of the resistor R50 is connected to the gates of the P-channel field-effect transistor Q52 and the P-channel field-effect transistor Q53 respectively. The drains of the P-channel field-effect transistors Q52 and Q53 are connected to one end of the inductor L50. The other end of the inductor L50 is connected to one end of the second sampling resistor RS2 and one end of the capacitor C50. The collector of the PNP transistor Q51 and the other end of the capacitor C50 are grounded. The other end of the second sampling resistor RS2 is connected to the excitation terminal of the starter motor.

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